Agilent 4155B/4156B User’s Guide Vol.2, Edition 5 4-27
Making a Measurement
Sweep Measurements
To Define a User Function
1. Press Chan key in the PAGE CONTROL key group.
2. Select USER FCTN primary softkey.
3. In the NAME column, enter the user function name.
4. In the UNIT column, enter the units.
5. In the DEFINITION column, enter the user function definition.
The user function name must be 6 or less alphanumeric characters. First character
must be alphabet character. Name must be unique. Name is case sensitive. For
example, HFE is different from Hfe.
In the user function definition, you can enter an expression that consists of any of
the following:
• VNAME and INAME names that you entered on the CHANNELS: CHANNEL
DEFINITION screen.
• Other user functions.
• Numerical operators.
• Built-in functions such as DELTA and SQRT.
For details about expressions, numerical operators, and built-in functions, refer to
Chapter 7.
Example
The following figure shows an example setup to define Hfe.
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